There wouldn't be tech debt for v2 is the point: it'd be from scratch code-wise whilst applying the design/architecture lessons learned. A lot of tech decision

There wouldn't be tech debt for v2 is the point: it'd be from scratch code-wise whilst applying the design/architecture lessons learned. A lot of tech decisions are only apparent after the project is built - revealing them with a rapid protoype and then scrapping it to build "what should have been". Ultimately, as you say, it is pointless as there is little business incentive to work like this as most customers would gladly accept the crappy prototype as final.